Oral lichen planus is a chronic autoimmune mucocutaneous disorder affecting skin and mucosa of various parts of the body which is of an unspecific cause purpose of this study is to assess the role of vitamin D, which is now considered to be a causative factor in the development of the disease. The assessment is done through analysing various studies that were done and proven the association of vitamin D and lichen planus. In this review study, articles were collected from google scholar, pubmed, scopus and science direct. Out of data screening, 13 articles were found to be eligible for including in our study. According to our study vitamin D is found to be a risk factor in oral lichen planus.